拉曼光谱
相变
辛烷值
无定形固体
烷基
构象异构
化学
分析化学(期刊)
相(物质)
人口
结晶学
一级
材料科学
热力学
有机化学
分子
物理
人口学
数学
应用数学
社会学
光学
作者
Takahiro Takekiyo,Yoshihiro Koyama,Kiyoto Matsuishi,Yukihiro Yoshimura
标识
DOI:10.1021/acs.jpcb.0c07889
摘要
The high-pressure (HP) phase transition and conformational change of n-octane (hereafter abbreviation as n-C8) up to 15.3 GPa were studied using Raman spectroscopy to investigate the relationship between the HP phase state and the alkyl chain length of n-alkanes. The Raman spectral analysis of n-C8 indicated that the liquid-solid transition (solidification) occurs at ∼0.9 GPa and that the corresponding transition pressure of n-alkanes depends on their density. Further pressurization at ∼4 GPa increased the population of the gauche conformer, while the solid (order)-amorphous transition occurred at ∼6 GPa along with a change in the full width at half maximum of the ruby R1 fluorescence line. The comparison of our findings with previously reported results suggested that the even-odd effect in the HP phase transition after solidification of n-alkanes appears between n-C7 and n-C8 as their HP phase transition up to ∼15 GPa was different.
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